How to create a type of 'alarm event' based on acquired sensor data and system time?

Hello all,
I'm fairly new to LabVIEW and have successfully created a VI that reads voltage data from sensors. Each sensor outputs 2 voltage values and I treat these values as 2 different DBL values. I'd like to be able to record each voltage value as a base and then compare the subsequent data readings with that base. Once the base is determined, I'd like a sort of 'variable' set as "TIME" to be recorded at the moment the base voltage is recorded.
The alarm should occur (or anything Boolean set to TRUE I guess) once the continuously read voltage remains within certain limits for about 2 hours. I know I can compare the system time w/ the "TIME" that the voltage base value was recorded. If the voltage readings escape those limits, I'd like the voltage base value reset and the TIME set to the corresponding system time again.
I apologize in advance if this I haven't' described my problem well, but if anyone could help me figure out the best way to create this code, I would appreciate it much!
Thanks!
Solved!
Go to Solution.

ill try to illustrate a couple scenarios:
keep in mind that i dont necessarily want the voltages in these specific ranges, but just a range of +/- 20 mV ... in an above post i refer to a "base" voltage reading, in this case that would be 200 mV for V1 and 400 mV for V2, just because the voltage has shifted to those values for an extended amount of time each (> 2 seconds)
Scenario 1
1:00 pm
Sensor readings
Voltage 1: 200 mV
Voltage 2: 400 mV
between 1:00 and 3:00 pm:
Voltage 1 does not deviate from 180-220 mV range
Voltage 2 does not deviate from 380-420 mV range
at 3:00pm I want an alert/alarm/Boolean to change to 'true'
Scenario 2
1:00 pm
Sensor readings
Voltage 1: 200 mV
Voltage 2: 400 mV
at 1:45 pm:
Voltage 1: 2 mV
Voltage 2: 600 mV
Since the voltage has shifted out of the range, i want the new base voltage to equal whatever it changed to out of the range, and also the time spent within the new range (2 +/- 20 mV and 600 +/- 20 mV, respectively for V1 and V2) would be reset, so a new 2-hour counter would begin

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